基本上,当我们生气,心奋,害怕,滉张或及动 的时候,我们就得读快一些。相反的,当我们悲伤或失望的时候,我们就得把速度减慢些。
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Experiment #7 - Forces (Frictional Force)
Experiment #6 - Forces (Frictional Force)